MailPluginFix is a free tool which will help you to fix any incompatible plugin (GrowlMail for example) after an update of Mac OS X.

MailPluginFix Screenshot

Just start the application and you will see a list of all incompatible plugins for your current installation. Just select the ones you would like to fix and press the start button in the toolbar. All selected plugins will get patched with the UIDs of the current version and also all disabled plugins will be enabled again.


  • Mac OS X 10.6 or later
  • Works only with plugins installed in the user library folder. If you want to fix a plugin which is installed for all users you have to move it to ~/Library/Mail/Bundles first.


Version 1.3.0 - 21th September, 2016

  • Added support for macOS Sierra. Important: macOS 10.12 is a major update and many mail plugins are not yet compatible with the new Before trying to fix a plugin check for an official plugin update and don’t forget to backup!
  • Added toolbar button for opening the Mail library folder.
  • Fixed info window width.

Version 1.2.2 - 13th July, 2016

  • Fixed a problem with the Apple code signing.

Version 1.2.1 - 12th July, 2016

  • Update is now using a secure HTTPS connection.
  • MailPluginFix is now signed with a developer certificate from Apple.

Version 1.2.0 - 9th October, 2013

  • Added support for OS X 10.9 Mavericks. Please note that at the moment some plugins are not compatible with the new Mavericks If the plugin is not fully working after using this tool you will have to wait for the official update of your plugin.
  • Added error handling for non modifiable Bundle directories.
  • Fixed detection of running

Version 1.1.0 - 21th June, 2011

  • Added info panel
  • Added online update using the Sparkle framework
  • Minor bugfixes

If this tool was helpful for you we would appreciate your donation to support our coffee consume: